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Thompson # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, version 3 of the License. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . import os import re import sys import subprocess try: # For Python3, try and import input from builtins from builtins import input except Exception: # But fall back to using the default input True PKG = "byobu" SHELL = os.getenv("SHELL", "/bin/bash") HOME = os.getenv("HOME") BYOBU_CONFIG_DIR = os.getenv("BYOBU_CONFIG_DIR", HOME + "/.byobu") BYOBU_BACKEND = os.getenv("BYOBU_BACKEND", "tmux") choice = -1 sessions = [] text = [] reuse_sessions = os.path.exists("%s/.reuse-session" % (BYOBU_CONFIG_DIR)) BYOBU_UPDATE_ENVVARS = ["DISPLAY", "DBUS_SESSION_BUS_ADDRESS", "SESSION_MANAGER", "GPG_AGENT_INFO", "XDG_SESSION_COOKIE", "XDG_SESSION_PATH", "GNOME_KEYRING_CONTROL", "GNOME_KEYRING_PID", "GPG_AGENT_INFO", "SSH_ASKPASS", "SSH_AUTH_SOCK", "SSH_AGENT_PID", "WINDOWID", "UPSTART_JOB", "UPSTART_EVENTS", "UPSTART_SESSION", "UPSTART_INSTANCE"] def get_sessions(): sessions = [] i = 0 output = False if BYOBU_BACKEND == "screen": try: output = subprocess.Popen(["screen", "-ls"], stdout=subprocess.PIPE).communicate()[0] except subprocess.CalledProcessError as cpe: # screen -ls seems to always return 1 if cpe.returncode != 1: raise else: output = cpe.output if sys.stdout.encoding is None: output = output.decode("UTF-8") else: output = output.decode(sys.stdout.encoding) if output: for s in output.splitlines(): s = re.sub(r'\s+', ' ', s) # Ignore hidden sessions (named sessions that start with a "." or a "_") if s and s != " " and (s.find(" ") == 0 and len(s) > 1 and s.count("..") == 0 and s.count("._") == 0): text.append("screen: %s" % s.strip()) items = s.split(" ") sessions.append("screen____%s" % items[1]) i += 1 if BYOBU_BACKEND == "tmux": output = subprocess.Popen(["tmux", "list-sessions"], stdout=subprocess.PIPE).communicate()[0] if sys.stdout.encoding is None: output = output.decode("UTF-8") else: output = output.decode(sys.stdout.encoding) if output: for s in output.splitlines(): # Ignore hidden sessions (named sessions that start with a "_") if s and not s.startswith("_") and s.find("-") == -1: text.append("tmux: %s" % s.strip()) sessions.append("tmux____%s" % s.split(":")[0]) i += 1 return sessions def cull_zombies(session_name): # When using tmux session groups, closing a client will leave # unattached "zombie" sessions that will never be reattached. # Search for and kill any unattached hidden sessions in the same group if BYOBU_BACKEND == "tmux": output = subprocess.Popen(["tmux", "list-sessions"], stdout=subprocess.PIPE).communicate()[0] if sys.stdout.encoding is None: output = output.decode("UTF-8") else: output = output.decode(sys.stdout.encoding) if not output: return # Find the master session to extract the group name. We use # the group number to be extra sure the right session is getting # killed. We don't want to accidentally kill the wrong one pattern = "^%s:.+\\((group [^\\)]+)\\).*$" % session_name master = re.search(pattern, output, re.MULTILINE) if not master: return # Kill all the matching hidden & unattached sessions pattern = "^_%s-\\d+:.+\\(%s\\)$" % (session_name, master.group(1)) for s in re.findall(pattern, output, re.MULTILINE): subprocess.Popen(["tmux", "kill-session", "-t", s.split(":")[0]]) def update_environment(session): backend, session_name = session.split("____", 2) for var in BYOBU_UPDATE_ENVVARS: value = os.getenv(var) if value: if backend == "tmux": cmd = ["tmux", "setenv", "-t", session_name, var, value] else: cmd = ["screen", "-S", session_name, "-X", "setenv", var, value] subprocess.call(cmd, stdout=open(os.devnull, "w")) def attach_session(session): update_environment(session) backend, session_name = session.split("____", 2) cull_zombies(session_name) # must use the binary, not the wrapper! if backend == "tmux": if reuse_sessions: os.execvp("tmux", ["tmux", "-u", "new-session", "-t", session_name, ";", "set-option", "destroy-unattached"]) else: os.execvp("tmux", ["tmux", "-u", "attach", "-t", session_name]) else: os.execvp("screen", ["screen", "-AOxRR", session_name]) sessions = get_sessions() show_shell = os.path.exists("%s/.always-select" % (BYOBU_CONFIG_DIR)) if len(sessions) > 1 or show_shell: sessions.append("NEW") text.append("Create a new Byobu session (%s)" % BYOBU_BACKEND) sessions.append("SHELL") text.append("Run a shell without Byobu (%s)" % SHELL) if len(sessions) > 1: sys.stdout.write("\nByobu sessions...\n\n") tries = 0 while tries < 3: i = 1 for s in text: sys.stdout.write(" %d. %s\n" % (i, s)) i += 1 try: try: user_input = input("\nChoose 1-%d [1]: " % (i - 1)) except Exception: user_input = "" if not user_input or user_input == "": choice = 1 break try: choice = int(user_input) except Exception: choice = int(eval(user_input)) if choice >= 1 and choice < i: break else: tries += 1 choice = -1 sys.stderr.write("\nERROR: Invalid input\n") except KeyboardInterrupt: sys.stdout.write("\n") sys.exit(0) except Exception: if choice == "" or choice == -1: choice = 1 break tries += 1 choice = -1 sys.stderr.write("\nERROR: Invalid input\n") elif len(sessions) == 1: # Auto-select the only session choice = 1 if choice >= 1: if sessions[choice - 1] == "NEW": # Create a new session if BYOBU_BACKEND == "tmux": os.execvp("byobu", ["byobu", "new-session", SHELL]) else: os.execvp("byobu", ["byobu", SHELL]) elif sessions[choice - 1] == "SHELL": os.execvp(SHELL, [SHELL]) else: # Attach to the chosen session; must use the binary, not the wrapper! attach_session(sessions[choice - 1]) # No valid selection, default to the youngest session, create if necessary if BYOBU_BACKEND == "tmux": os.execvp("tmux", ["tmux"]) else: os.execvp("screen", ["screen", "-AOxRR"])